Category: Fuel and Combustion
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Grading of Coal
The grading of coal is done on the following basis: For example, a coal grade written as 5–10 cm, 20,000 – A8-F24 – F1.6 indicates that the coal has Size: 5–10 cm C.V.: 20,000 kJ/kg Ash: 8–10% Ash softening temperature: 2400–2500°F Sulphur content: 1.4–1.6%
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Ranking of Coal
Rank is an inherent property of the fuel, depending upon its relative progression in the classification process. The ranking of coal is based on the fixed carbon and heating value of the mineral matter free analysis. The ASME (American Society of Mechanical Engineers) and ASTM (American Society of Testing and Materials) have accepted the following…
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Desirable Properties of Coal
A good coal should have the following properties:
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Secondary Fuels
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Primary Fuels
The calorific value of solid fuels is given in Table 1.2. Table 1.2 Calorific value of solid fuels
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CLASSIFICATION OF FUELS
Fuels may be classified as follows: Table 1.1 Classification of fuels
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INTRODUCTION
A fuel may be defined as a substance, which on burning with oxygen produces a large amount of heat. A fuel is mainly composed of carbon and hydrogen. The energy produced by burning of fuel in the form of heat is known as chemical energy.